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【简答题】
( )是保证润滑油在润滑系内循环流动,并在发动机任何转速下以足够高的压力向润滑部位输送足够数量的润滑油。
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皮皮学刷刷变学霸
举一反三
【单选题】设函数y=f(-x 2 )，则dy等于( )
A.
xf'(-x 2 )dx
B.
-2xf'(-x 2 )dx
C.
2f(-x 2 )dx
D.
2xf'(-x 2 )dx
【简答题】求势函数u(x，y)，使得 (1)du=(3x 2 -3y 2 +4)dx-6xydy (2)du=(e x siny+2xy 2 )dx+(e x cosy+2x 2 y)dy.
【简答题】Passage One Questions 56 to 60 are based on the following passage. Last week I visited one of my old neighborhoods in Washington D.C. I had not been there for twenty years and as I walked along the st...
【简答题】Professor Martin’s report says that children who attend a number of different schools, because their parents have to move around the country, probably make slow progress in their studies. There are al...
【简答题】Passage Two Questions 1 to 5 are based on the following passage. Forgiving is easy. Forgetting the experience that comes before the forgiveness, however, always remains with us. Choosing to forgive me...
【简答题】2xydy=(2y 2 -x)dx．
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